using the brass of G.P.O 5 and JABB in Sibelius ultimate 2020.3, I am stumbling over a strange behavior.
I believe this to be one of the many bugs in Aria Player:
Some instruments are transposed a minor third higher, and I cannot make out why. A demonstration video of the Aria Player being used as a plugin in Sibelius is here:
System: Intel(R)Core(TM) email@example.com GHz,16GB RAM, C/: SSD 1 TB, E/: HHD 1TB, G/:SSD 451 GB,NVidia GT 610
OS: Windows 10 home 64 bit Version 1909 Build 18363.836